Add both versions
Paste very long texts or extract them from TXT, PDF and DOCX documents.
A complete comparison in three steps
No AI provider, no detector credits and no registration.
Compare locally
A background browser process aligns words and punctuation without freezing the page.
Review and merge
Navigate line by line, choose A or B for each change and export one exact merged version.
More than a red-and-green diff
Useful checks that add value without adding provider cost.
Built for long texts
Up to 250,000 characters per version, rendered in bounded pages.
Deterministic A/B merge
Every decision uses a literal fragment from one version, with undo, redo and bulk actions.
Verifiable data guard
Flags numbers, URLs and email addresses that disappeared or appeared.
Private local draft
Your two texts are restored on this device through browser storage.
Multilingual segmentation
Uses the browser's language-aware segmenter, including CJK, Thai and RTL text.